Preparation of polyorganosiloxanes with controlled low-levels of

Details Preparation of polyorganosiloxanes with controlled low-levels of Preparation of polyorganosiloxanes with controlled low-levels of

1990-11-14

1993-03-02

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

556467, 556469, C08G 7706

Patent

active

051910535

ABSTRACT:
The described process uses aqueous hydrogen chloride as a catalyst to effect the condensation of chloride and hydroxy end-substituted polyorganosiloxanes, in the presence of triorganosilyl endblocker to control chain length. The inventors have discovered that within a range of about 10 to 30 percent aqueous solution of hydrogen chloride, it is possible to produce polyorganosiloxanes with low levels of chloride and hydroxy substitution. Furthermore, it has been found that within this hydrogen chloride range, temperature and hydrogen chloride concentration can be controlled to produce polyorganosiloxane polymers with a reproducible and predictable level of hydroxy substitution.

REFERENCES:
patent: 2467976 (1949-04-01), Hyde
patent: 2469888 (1949-05-01), Patnode
patent: 2491843 (1949-12-01), Wilcock
patent: 2758124 (1956-08-01), Schwenker
patent: 2779776 (1957-01-01), Hyde

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